什么是Trunking协议？Trunking协议的封装都有哪两个？（）

A . VTP allows routing between VLANs. B . VTP allows a single switch port to carry information to more than one VLAN. C . VTP allows physically redundant links while preventing switching loops. D . VTP simplifies switch administration by allowing switches to automatically share VLAN configuration information. E . VTP helps to limit configuration errors by keeping VLAN naming consistent across the VTP domain. F . VTP enhances security by preventing unauthorized hosts from connecting to the VTP domain.

A . VTP allows routing between VLANs. B . VTP allows a single switch port to carry information to more than one VLAN. C . VTP allows physically redundant links while preventing switching loops. D . VTP simplifies switch administration by allowing switches to automatically share VLAN configuration information. E . VTP helps to limit configuration errors by keeping VLAN naming consistent across the VTP domain. F . VTP enhances security by preventing unauthorized hosts from connecting to the VTP domain.

A . Each end of the trunk line must be set to IEEE 802.1E encapsulation. B . The VTP management domain name of both switches must be set the same. C . All ports on both the switches must be set as access port. D . One of the two switches must be configured as a VTP server. E . A rollover cable is required to connect the two switches together. F . A router must be used to forward VTP traffic between VLANs.

A . 802.1Q native VLAN frames are untagged by default. B . 802.1Q trunking ports can also be secure ports. C . 802.1Q trunks can use 10 Mb/s Ethernet interfaces. D . 802.1Q trunks require full-duplex， point-to-point connectivity. E . 802.1Q trunks should have native VLANs that are the same at both ends.

A .  The interface actively attempts to convert the link to a trunk link. B .  The interface is put into permanent trunking mode but prevented from generating DTP frames.   C .  The interface is put into permanent trunking mode and negotiates to convert the link into a trunk  link. D .  The interface is put into a passive mode， waiting to convert the link to a trunk link.   E .  None of the other alternatives apply

A . to provide a mechanism to dynamically assign vlan membership to switch ports B . to allow traffic to be carried from multiple vlans over a single link between switches C . to allow native vlan information to be carried over a trunk link D . to provide a mechanism to manually assign vlan membership to switch ports E . to allow for managing the additions,deletions,and changes of vlans between switch

A .  It tags the data frame with VLAN information and recalculates the CRC value B .  It encapsulates the data frame with a new header and frame check sequence C .  It modifies the port index of a data frame to indicate the VLAN D .  It adds a new header containing the VLAN ID to the data frame E .  None of the other alternatives apply

A . 802.1Q native VLAN frames are untagged by default. B . 802.1Q trunking ports can also be secure ports. C . 802.1Q trunks can use 10 Mb/s Ethernet interfaces. D . 802.1Q trunks require full-duplex, point-to-point connectivity. E . 802.1Q trunks should have native VLANs that are the same at both ends.

A . The Cisco Control VLAN carries only Layer 2 control traffic B . 802.1Q trunking is used between the access switch and the router C . There is no 802.1Q trunking used in these designs D . When 802.1Q trunks are configured， they are also called Native VLANs E . Trunking Ensures that traffic from only one VLAN is carried on that trunk

A .  It supports autonegotiation for both ISL and IEEE 802.1Q trunks. B .  It must be disabled on an interface if you do not want the interface to work as a trunk or start negotiation to become a trunk. C .  It is a point-to-multipoint protocol. D .  It is a point-to-point protocol. E .  It is not supported on private VLAN ports or tunneling ports.

A . transparent B . auto C . on D . desirable E . client F . forwarding

A . The VLAN ID of all known VLANs，the management domain name，and the total number of trunk links on the switch. B . The VLAN ID of all known VLANs，a 1-bit canonical format （CF1 Indicator），and the switch  configuration revision number. C . The management domain name，the switch configuration revision number，the known VLANs，  and their specific parameters. D . A 2-byte TPID with a fixed value of 0x8100 for the management domain number，the switch  configuration revision number，the known VLANs，and their specific parameters. E . None of the other alternatives apply.

A .  Negotiate B .  Designate C .  No negotiate D .  Auto E .  Manual F .  Off

A . one IP network or subnetwork for each subinterface B . subinterface numbering that matches vlan tages C . subinterface encapsulation identifiers that match vlan tags D . a management domain for each subinterface E . one physical interface for each subinterface F . one subinterface per vla

A . VTP messages will not be forwarded over nontrunk links. B . VTP domain names need to be identical. However，case doesn’t matter. C . A VTP enabled device which receives multiple advertisements will ignore advertisements with higher configuration revision numbers. D . A device in "transparent" VTP v.1 mode will not forward VTP messages. E . VTP pruning allows switches to prune VLANs that do not have any active ports associated with  them.

A . one IP network or subnetwork for each subinterface B . subinterface numbering that matches vlan tages C . subinterface encapsulation identifiers that match vlan tags D . a management domain for each subinterface E . one physical interface for each subinterface F . one subinterface per vla

A . no switchport trunk native vlan vlan-id B . switchport nonegotiate C . no switchport mode dynamic desirable D . switchport mode acce

A . not good B . good C . better D . the best

A .  CompanySwitch（config-if）#switchport trunk encapsulation dot1q B .  CompanySwitch（config-if）#switchport trunk encapsulation itef C .  CompanySwitch（config-if）#switchport trunk encapsulation fddi D .  CompanySwitch（config-if）#switchport trunk encapsulation isl E .  None of the other alternatives apply

是 否

A．Trunking是中继协议，他的封装有802.1D和802.1P B．Trunking是中继协议，他有两个封装模式：一种是Cisco的ISL，一个是IEEE的802.1Q C．Trunking不是协议，没有封装 D．Trunking是路由协议，他没有封装